U.S. President Donald Trump visits the U.S.-Mexico border in Calexico Calif., April 5, 2019. Trump said May 30 that he would impose a 5 percent tariff on all imported goods from Mexico beginning June 10 to push that country to help stem the flow of immigrants coming across the border and entering the U.S. illegally. He said the tax would "gradually increase" until the flow of immigrants stopped. (CNS/Reuters/Kevin Lamarque)